079
FNCA52 TJSJ 050739
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
339 AM AST MON JAN 5 2026
DISCUSSION
A FRONTAL BOUNDARY AND ASSOCIATED UPPER LEVEL TROUGH WILL INCREASE
CLOUDINESS THROUGHOUT THE DAY, WITH SHOWERS AND THUNDERSTORMS
DEVELOPING ALONG THE INTERIOR AND SOUTHERN SECTIONS OF PUERTO
RICO. WIND SPEEDS ARE EXPECTED TO REMAIN AT LESS THAN 15 MPH AND
THE RELATIVE HUMIDITY SHOULD REMAIN ABOVE 60% IN GENERAL ACROSS
MOST AREAS. THEREFORE, THE FIRE DANGER WILL REMAIN LOW TODAY.
PRZ014-060745-
SOUTHEAST COASTAL PLAINS-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 90 30 70
TEMP (24H TREND) 87 (+2) 67 (-3) 86
RH % (24H TREND) 61 (+2) 98 (+2) 61
WIND 20FT/EARLY(MPH) SE 6 NE 6 NE 11
WIND 20FT/LATE(MPH) SE 6 NE 6 NE 11
MIXING HGT(FT-AGL/MSL)4260 3520
TRANSPORT WND (MPH) NE 2 N 8
VENT RATE (KT-FT) 8520 24640
DISPERSION 5 5
DSI 4 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-060745-
SOUTHERN HILLS-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 90 40 70
TEMP (24H TREND) 83 (+3) 64 (-4) 81
RH % (24H TREND) 66 (-6) 98 (+2) 67
WIND 20FT/EARLY(MPH) E 6 NE 5 NE 9
WIND 20FT/LATE(MPH) E 6 NE 5 NE 9
MIXING HGT(FT-AGL/MSL)4930 3710
TRANSPORT WND (MPH) N 3 N 8
VENT RATE (KT-FT) 14790 25970
DISPERSION 5 5
DSI 4 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-060745-
NORTH COASTAL PLAINS-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLDY MCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 80 60
TEMP (24H TREND) 84 (-2) 67 (-3) 83
RH % (24H TREND) 66 (+1) 100 (+2) 67
WIND 20FT/EARLY(MPH) N 11 E 9 NE 12
WIND 20FT/LATE(MPH) N 11 E 9 NE 12
MIXING HGT(FT-AGL/MSL)4340 4140
TRANSPORT WND (MPH) N 9 NE 10
VENT RATE (KT-FT) 34720 37260
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-060745-
NORTHERN HILLS-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS
CHANCE PRECIP (%) 60 60 50
TEMP (24H TREND) 84 (0) 66 (-2) 82
RH % (24H TREND) 67 (+3) 100 (+3) 69
WIND 20FT/EARLY(MPH) N 10 E 9 NE 12
WIND 20FT/LATE(MPH) N 10 E 9 NE 12
MIXING HGT(FT-AGL/MSL)4770 4140
TRANSPORT WND (MPH) N 6 NE 12
VENT RATE (KT-FT) 23850 41400
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-060745-
WEST COAST-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 70 30 70
TEMP (24H TREND) 86 (0) 67 (-3) 85
RH % (24H TREND) 65 (-2) 99 (+3) 66
WIND 20FT/EARLY(MPH) NE 10 NE 11 NE 14
WIND 20FT/LATE(MPH) NE 10 NE 11 NE 14
MIXING HGT(FT-AGL/MSL)4200 4060
TRANSPORT WND (MPH) NE 5 NE 13
VENT RATE (KT-FT) 16800 44660
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-060745-
EASTERN INTERIOR-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS
CHANCE PRECIP (%) 80 70 50
TEMP (24H TREND) 84 (+2) 66 (-3) 82
RH % (24H TREND) 66 (-3) 100 (+2) 70
WIND 20FT/EARLY(MPH) N 8 N 6 NE 9
WIND 20FT/LATE(MPH) N 8 N 6 NE 9
MIXING HGT(FT-AGL/MSL)5030 3620
TRANSPORT WND (MPH) NW 7 N 10
VENT RATE (KT-FT) 30180 32580
DISPERSION 5 5
DSI 4 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-060745-
LUQUILLO MOUNTAIN RANGE-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS
CHANCE PRECIP (%) 80 80 50
TEMP (24H TREND) 80 (+2) 63 (-4) 78
RH % (24H TREND) 71 (-5) 100 (0) 73
WIND 20FT/EARLY(MPH) N 5 LGT/VAR NE 6
WIND 20FT/LATE(MPH) N 5 LGT/VAR NE 6
MIXING HGT(FT-AGL/MSL)4020 3600
TRANSPORT WND (MPH) NW 7 N 9
VENT RATE (KT-FT) 24120 28800
DISPERSION 5 5
DSI 4 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-060745-
CENTRAL MOUNTAIN RANGE-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 80 40 70
TEMP (24H TREND) 80 (+1) 63 (-3) 80
RH % (24H TREND) 67 (-3) 100 (+3) 69
WIND 20FT/EARLY(MPH) NE 10 NE 9 NE 13
WIND 20FT/LATE(MPH) NE 10 NE 9 NE 13
MIXING HGT(FT-AGL/MSL)5220 3990
TRANSPORT WND (MPH) N 5 NE 10
VENT RATE (KT-FT) 20880 35910
DISPERSION 5 5
DSI 4 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-060745-
CAYEY MOUNTAIN RANGE-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 90 50 70
TEMP (24H TREND) 80 (+2) 64 (-3) 77
RH % (24H TREND) 70 (-5) 100 (0) 74
WIND 20FT/EARLY(MPH) SE 5 LGT/VAR NE 8
WIND 20FT/LATE(MPH) SE 5 LGT/VAR NE 8
MIXING HGT(FT-AGL/MSL)4730 3640
TRANSPORT WND (MPH) N 6 N 10
VENT RATE (KT-FT) 23650 32760
DISPERSION 5 5
DSI 4 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-060745-
VIEQUES-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 60 70 60
TEMP (24H TREND) 85 (0) 70 (-2) 85
RH % (24H TREND) 62 (-2) 100 (+2) 60
WIND 20FT/EARLY(MPH) SW 6 N 9 NE 12
WIND 20FT/LATE(MPH) SW 6 N 9 NE 12
MIXING HGT(FT-AGL/MSL)2630 3480
TRANSPORT WND (MPH) N 8 NE 13
VENT RATE (KT-FT) 18410 38280
DISPERSION 5 5
DSI 5 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-060745-
CULEBRA-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 60
TEMP (24H TREND) 86 (+1) 71 (-3) 85
RH % (24H TREND) 61 (-6) 99 (+5) 61
WIND 20FT/EARLY(MPH) SW 6 NE 9 NE 11
WIND 20FT/LATE(MPH) SW 6 NE 9 NE 11
MIXING HGT(FT-AGL/MSL)2530 3500
TRANSPORT WND (MPH) N 7 NE 13
VENT RATE (KT-FT) 15180 38500
DISPERSION 5 5
DSI 5 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-060745-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 70 40 70
TEMP (24H TREND) 88 (+2) 67 (-4) 87
RH % (24H TREND) 59 (0) 95 (+4) 59
WIND 20FT/EARLY(MPH) SE 6 NE 11 SE 14 G17
WIND 20FT/LATE(MPH) SE 6 NE 11 SE 14 G17
MIXING HGT(FT-AGL/MSL)4780 3650
TRANSPORT WND (MPH) E 3 N 7
VENT RATE (KT-FT) 14340 21900
DISPERSION 4 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-060745-
SAINT THOMAS AND SAINT JOHN-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 70 60
TEMP (24H TREND) 85 (+1) 70 (-4) 85
RH % (24H TREND) 61 (-6) 100 (+5) 60
WIND 20FT/EARLY(MPH) SW 5 NE 8 NE 11
WIND 20FT/LATE(MPH) SW 5 NE 8 NE 11
MIXING HGT(FT-AGL/MSL)3070 3470
TRANSPORT WND (MPH) N 7 NE 12
VENT RATE (KT-FT) 18420 34700
DISPERSION 5 5
DSI 5 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-060745-
ST CROIX-
339 AM AST MON JAN 5 2026
TODAY TONIGHT TUE
CLOUD COVER MCLDY MCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 60 60
TEMP (24H TREND) 86 (+1) 70 (-4) 86
RH % (24H TREND) 61 (-6) 100 (+7) 60
WIND 20FT/EARLY(MPH) LGT/VAR NE 5 NE 10
WIND 20FT/LATE(MPH) LGT/VAR NE 5 NE 10
MIXING HGT(FT-AGL/MSL)3660 3990
TRANSPORT WND (MPH) S 3 NE 10
VENT RATE (KT-FT) 10980 35910
DISPERSION 4 5
DSI 5 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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